The Lambda Cold Dark Matter (ΛCDM) model is currently the best model to describe the development of the Universe from the Big Bang to the present time. It is composed of six parameters, two of them, Dark Energy (DE) and CDM, with unknown physical explanations. DE, leading to accelerated expansion of the Universe, is considered a scalar field characterized by exerting its force by repulsive gravity. We examined whether DE can be explained as the warping of spacetime in our Universe by external universes as components of a Multiverse or, in other words, as the gravitational pull exerted by other universes. The acceleration, the resultant kinetic energy, Ekin, and the cosmological constant, Λ, were calculated for one to four external universes. The acceleration is approx. 10-11 m/s2, which is in agreement with observations. Its value is dependent upon the numbers and relative positions of external universes. DE density is approx. 10-29 kg/m3 and Λ is in the range of 10-38 s-2 and 10-55 m-2, respectively. Warping of spacetime by external universes as a physical explanation for DE seems feasible and warrants further considerations.
References
[1]
Einstein, A. (1917) Kosmologische Betrachtungen zur allgemeinen Relativitätstheorie. Sitzungsberichte der Königlich Preuβischen Akademie der Wissenschaften, 142.
[2]
Einstein, A. (1931) Zum kosmologischen Problem der allgemeinen Relativitätstheorie. Sitzungsber. Preuss. Akad. Wiss. Berlin, 235.
[3]
Riess, A.G. (1998) Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant. The Astronomical Journal, 116, 1009. https://doi.org/10.1086/300499
[4]
Perlmutter, S., et al. (1999) The Supernova Cosmology Project, Measurements of Omega and Lambda from 42 High-Redshift Supernovae. The Astrophysical Journal, 517, 565.
[5]
Maeder, A., et al. (2020) Planck 2018 Results. VI. Cosmological Parameters. Astronomy & Astrophysics, 641, A6. https://doi.org/10.1051/0004-6361/202039265
[6]
Tegmark, M. (2003) Parallel Universes, Honoring John Wheeler’s 90th Birthday. Cambridge University Press, Cambridge. arXiv: astro-ph/0302131.
[7]
Riess, A.G., et al. (2001) The Farthest Known Supernova: Support for an Accelerating Universe and a Glimpse of the Epoch of Deceleration. The Astrophysical Journal, 560, 49. https://doi.org/10.1086/322348
[8]
Hawking, S.W. and Hertog, T. (2018) A Smooth Exit from Eternal Inflation? Journal of High Energy Physics, 2018, Article No. 147. https://doi.org/10.1007/JHEP04(2018)147
[9]
Penrose, R. (2012) Cycles of Time, an Extraordinary New View of the Universe. Vintage Books, a Division of Random House Incorporated, New York.
[10]
Mukhanov, V. (2014) Inflation without Selfreproduction. Fortschritte der Physik, 63, 36-41. https://doi.org/10.1002/prop.201400074
[11]
Carmeli, M. and Kuzmenko, T. (2001) Value of the Cosmological Constant: Theory versus Experiment. AIP Conference Proceedings, 586, 316. https://doi.org/10.1063/1.1419571
[12]
Ratra, P. and Peebles, L. (1988) Cosmological Consequences of a Rolling Homogeneous Scalar Field. Physical Review D, 37, 3406. https://doi.org/10.1103/PhysRevD.37.3406
[13]
Carroll, S.M., Duvvuri, V., Trodden, M., et al. (2004) Is Cosmic Speed-Up Due to New Gravitational Physics? Physical Review D, 70, Article ID: 043528. https://doi.org/10.1103/PhysRevD.70.043528
[14]
Dvali, G.R., Gabadadze, G. and Porrati, M. (2000) 4D Gravity on a Brane in 5D Minkowski Space. Physics Letters B, 485, 208-214. https://doi.org/10.1016/S0370-2693(00)00669-9
[15]
Corda, C. (2009) Interferometric Detection of Gravitational Waves: The Definitive Test for General Relativity. International Journal of Modern Physics D, 18, 2275-2282. https://doi.org/10.1142/S0218271809015904
[16]
Arimoto, M., et al. (2021) Gravitational Wave Physics and Astronomy in the Nascent Era. Progress of Theoretical and Experimental Physics, ptab042. https://doi.org/10.1093/ptep/ptab042
[17]
Ghosh, S., Kastaun, W. and Pratten, G. (2021) Rapid Model Comparison of Equations of State from Gravitational Wave Observation of Binary Neutron Star Coalescences. arXiv: 2104.08681 [gr-qc].
[18]
Talbot, C., Thrane, E., Biscoveanu, S. and Smith, R. (2021) Inference with Finite Time Series: Observing the Gravitational Universe through Windows. arXiv: 2106.13785 [astro-ph.IM]
[19]
Sedda, M.A., et al. (2021) The Missing Link in Gravitational-Wave Astronomy. A Summary of Discoveries Waiting in the Decihertz Range. Experimental Astronomy. https://doi.org/10.1007/s10686-021-09713-z
[20]
Cai, R.-G., Cao, Z., Guo, Z.-K., Wang, S.-J. and Yang, T. (2017) The Gravitational-Wave Physics. National Science Review, 4, 687-706.
[21]
Bian, L., et al. (2021) The Gravitational-Wave Physics II: Progress. arXiv: 2106.10235 [gr-qc].
[22]
Kusenko, A., et al. (2020) Exploring Primordial Black Holes from the Multiverse with Optical Telescopes. Physical Review Letters, 125, Article ID: 181304. https://doi.org/10.1103/PhysRevLett.125.181304
[23]
Walker, M.G. and Loeb, A. (2014) Is the Universe Simpler than LCDM? Contemporary Physics, 55, 198-211. https://doi.org/10.1080/00107514.2014.919741
[24]
Aghanim, N., et al. (2019) Planck 2018 Results. VI. Cosmological Parameters Astronomy and Astrophysics Manuscript No. msc ESO 2019.
[25]
Farnes, J.S. (2018) A Unifying Theory of Dark Energy and Dark Matter: Negative Masses and Matter Creation within a Modified ΛCDM Framework. Astronomy and Astrophysics, 620, A92. https://doi.org/10.1051/0004-6361/201832898
